Overnight High/Low Indicator: Formula, Settings and How to Read It
Overnight High/Low marks the extreme prices traded between the session open and the regular-hours open, then projects them across the remainder of the session. The boundary is expressed as a number of minutes after the session open, 930 by default, which places it at 08:30 CT.
Senzoukria · Indicators · Updated September 2026
Overnight High/Low ships with the Senzoukria desktop app, in the Profiles & levels group of the indicator catalogue. It is drawn on the price chart.
What Overnight High/Low measures
The indicator scans the bars from the 17:00 CT session open up to that offset and keeps the highest high and the lowest low of the stretch, the electronic-hours range. Expressing the boundary in minutes rather than as a wall-clock time keeps it correct all year, since daylight-saving transitions happen on Sunday at 02:00, outside the session. Levels are emitted only when the session has bars on both sides of the boundary: an overnight range with no regular session after it has nothing to project onto.
The formula, as implemented
This is not a description of how the indicator is usually defined elsewhere — it is what the shipped code computes, documented next to the implementation:
High/Low de l'overnight (ETH) : extrêmes des barres entre l'ouverture de session (17:00 CT) et l'open RTH, projetés sur le reste de la session. L'open RTH est exprimé en MINUTES APRÈS l'open de session (défaut 930 min = 15 h 30 → 08:30 CT, l'open RTH des indices CME). Offset fixe correct toute l'année : les bascules DST ont lieu le dimanche 02:00, hors session. Émis seulement quand la session a des barres des DEUX côtés de la frontière (un ON high sans séance RTH n'a rien à projeter).
How to read it
- The overnight range is built on lower participation; the regular session then either trades inside it or moves beyond it.
- A regular session opening outside the overnight range starts past the extremes set by the thinner hours, leaving both levels behind price.
- Repeated tests of the overnight high or low during the regular session show those prices still being used as references by the busier part of the day.
- An overnight range that is wide compared with recent sessions was built while European or Asian hours were trading, or around a release scheduled in those hours; the initial balance then shows whether the regular session confirmed that activity.
- Both levels stop updating at the boundary, so from then on they are historical marks.
Parameters and defaults
RTH open (min after 17:00 CT) defaults to 930, fifteen and a half hours after the session open, which is the regular-hours open of the CME index futures. It accepts 60 to 1200 in 15-minute steps, enough to match a contract whose regular session starts elsewhere in the day. The colour defaults to #2962ff.
| Parameter | Type | Default | Range |
|---|---|---|---|
| RTH open (min after 17:00 CT) | number | 930 | 60 – 1200 |
What it does not show
The offset is a setting, not a detection: point it at the wrong time and the indicator will faithfully mark the extremes of the wrong window, shortened and holiday sessions included. Overnight liquidity is thin, so an extreme can come from very few contracts, and the level is not weighted by the volume traded there. The levels also require history that actually covers the electronic hours; that history comes from your data provider, who bills the feed separately from the software subscription, and a subscription without those hours leaves the levels absent or wrong.
Using it in Senzoukria
Add it from the Indicators panel of any footprint chart or candle chart. It runs on futures data from Rithmic or Databento and on crypto pairs from Binance and Bybit, on the same engine — the calculation does not change with the venue, only the data feeding it does. Market data subscriptions are billed by the provider, separately from the app.
Related indicators
- Rolling VPOC — Profiles & levels
- Session POC (developing) — Profiles & levels
- Session VAH/VAL (developing) — Profiles & levels
- Initial Balance — Profiles & levels
- Session Open — Profiles & levels
- Prior Session H/L/C — Profiles & levels
See the full indicator library, or start with the order flow guide if you are new to reading aggression, delta and absorption.
Frequently asked questions
- What are the overnight high and low in futures?
- They are the extreme prices traded between the session open and the regular-hours open, the electronic-hours part of the trading day. On CME index futures with the default settings that spans 17:00 CT to 08:30 CT. Traders commonly use them as reference levels for the regular session that follows.
- How do I set the overnight window for a contract with a different schedule?
- Change the RTH open parameter, expressed in minutes after the 17:00 CT session open. The default of 930 corresponds to 08:30 CT, and the setting accepts 60 to 1200 in 15-minute steps, so any regular-hours open within that span can be matched.
- Does the overnight high/low handle daylight saving time?
- Yes, because the boundary is a fixed offset from the session open rather than a wall-clock time. Daylight-saving transitions take place on Sunday at 02:00, outside the session, so the offset stays correct across the change.